package com.xy.novelweb.utils;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class FileTypeUtil {

		//默认判断文件头前三个字节内容
		public static int CHECK_BYTES_NUMBER = 3;

		public final static Map<String, String> FILE_TYPE_MAP = new HashMap<String, String>();

		private FileTypeUtil() {
		}

		static {
				getAllFileType(); //初始化文件类型信息
		}

		/**
		 * Discription:[getAllFileType,常见文件头信息]
		 */
		private static void getAllFileType() {
				FILE_TYPE_MAP.put("ffd8ffe000104a464946", "jpg"); //JPEG (jpg)
				FILE_TYPE_MAP.put("89504e470d0a1a0a0000", "png"); //PNG (png)
				FILE_TYPE_MAP.put("47494638396126026f01", "gif"); //GIF (gif)
				FILE_TYPE_MAP.put("49492a00227105008037", "tif"); //TIFF (tif)
				FILE_TYPE_MAP.put("424d228c010000000000", "bmp"); //16色位图(bmp)
				FILE_TYPE_MAP.put("424d8240090000000000", "bmp"); //24位位图(bmp)
				FILE_TYPE_MAP.put("424d8e1b030000000000", "bmp"); //256色位图(bmp)
				FILE_TYPE_MAP.put("41433130313500000000", "dwg"); //CAD (dwg)
				FILE_TYPE_MAP.put("3c21444f435459504520", "html"); //HTML (html)
				FILE_TYPE_MAP.put("3c21646f637479706520", "htm"); //HTM (htm)
				FILE_TYPE_MAP.put("48544d4c207b0d0a0942", "css"); //css
				FILE_TYPE_MAP.put("696b2e71623d696b2e71", "js"); //js
				FILE_TYPE_MAP.put("7b5c727466315c616e73", "rtf"); //Rich Text Format (rtf)
				FILE_TYPE_MAP.put("38425053000100000000", "psd"); //Photoshop (psd)
				FILE_TYPE_MAP.put("46726f6d3a203d3f6762", "eml"); //Email [Outlook Express 6] (eml)
				FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "doc"); //MS Excel 注意：word、msi 和 excel的文件头一样
				FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "vsd"); //Visio 绘图
				FILE_TYPE_MAP.put("5374616E64617264204A", "mdb"); //MS Access (mdb)
				FILE_TYPE_MAP.put("252150532D41646F6265", "ps");
				FILE_TYPE_MAP.put("255044462d312e350d0a", "pdf"); //Adobe Acrobat (pdf)
				FILE_TYPE_MAP.put("2e524d46000000120001", "rmvb"); //rmvb/rm相同
				FILE_TYPE_MAP.put("464c5601050000000900", "flv"); //flv与f4v相同
				FILE_TYPE_MAP.put("00000020667479706d70", "mp4");
				FILE_TYPE_MAP.put("49443303000000002176", "mp3");
				FILE_TYPE_MAP.put("000001ba210001000180", "mpg"); //
				FILE_TYPE_MAP.put("3026b2758e66cf11a6d9", "wmv"); //wmv与asf相同
				FILE_TYPE_MAP.put("52494646e27807005741", "wav"); //Wave (wav)
				FILE_TYPE_MAP.put("52494646d07d60074156", "avi");
				FILE_TYPE_MAP.put("4d546864000000060001", "mid"); //MIDI (mid)
				FILE_TYPE_MAP.put("504b0304140000000800", "zip");
				FILE_TYPE_MAP.put("526172211a0700cf9073", "rar");
				FILE_TYPE_MAP.put("235468697320636f6e66", "ini");
				FILE_TYPE_MAP.put("504b03040a0000000000", "jar");
				FILE_TYPE_MAP.put("4d5a9000030000000400", "exe");//可执行文件
				FILE_TYPE_MAP.put("3c25402070616765206c", "jsp");//jsp文件
				FILE_TYPE_MAP.put("4d616e69666573742d56", "mf");//MF文件
				FILE_TYPE_MAP.put("3c3f786d6c2076657273", "xml");//xml文件
				FILE_TYPE_MAP.put("494e5345525420494e54", "sql");//xml文件
				FILE_TYPE_MAP.put("7061636b616765207765", "java");//java文件
				FILE_TYPE_MAP.put("406563686f206f66660d", "bat");//bat文件
				FILE_TYPE_MAP.put("1f8b0800000000000000", "gz");//gz文件
				FILE_TYPE_MAP.put("6c6f67346a2e726f6f74", "properties");//bat文件
				FILE_TYPE_MAP.put("cafebabe0000002e0041", "class");//bat文件
				FILE_TYPE_MAP.put("49545346030000006000", "chm");//bat文件
				FILE_TYPE_MAP.put("04000000010000001300", "mxp");//bat文件
				FILE_TYPE_MAP.put("504b0304140006000800", "docx");//docx文件
				FILE_TYPE_MAP.put("d0cf11e0a1b11ae10000", "wps");//WPS文字wps、表格et、演示dps都是一样的
				FILE_TYPE_MAP.put("6431303a637265617465", "torrent");


				FILE_TYPE_MAP.put("6D6F6F76", "mov"); //Quicktime (mov)
				FILE_TYPE_MAP.put("FF575043", "wpd"); //WordPerfect (wpd)
				FILE_TYPE_MAP.put("CFAD12FEC5FD746F", "dbx"); //Outlook Express (dbx)
				FILE_TYPE_MAP.put("2142444E", "pst"); //Outlook (pst)
				FILE_TYPE_MAP.put("AC9EBD8F", "qdf"); //Quicken (qdf)
				FILE_TYPE_MAP.put("E3828596", "pwl"); //Windows Password (pwl)
				FILE_TYPE_MAP.put("2E7261FD", "ram"); //Real Audio (ram)
		}


		/**
		 * 根据制定文件的文件头判断其文件类型
		 *
		 * @param filePaht
		 * @return
		 */
		public static String getFileType(String filePaht) {
				String res = null;

				try {
						FileInputStream is = new FileInputStream(filePaht);
						getFileType(is);
				} catch (FileNotFoundException e) {
						e.printStackTrace();
				}
				return res;
		}

		public static String getFileType(InputStream in) {
				String res = null;
				try {

						byte[] b = new byte[CHECK_BYTES_NUMBER];
						in.read(b, 0, b.length);
						String fileCode = bytesToHexString(b);

//            System.out.println(fileCode);


						//这种方法在字典的头代码不够位数的时候可以用但是速度相对慢一点
						Iterator<String> keyIter = FILE_TYPE_MAP.keySet().iterator();
						while (keyIter.hasNext()) {
								String key = keyIter.next();
								if (key.toLowerCase().startsWith(fileCode.toLowerCase()) || fileCode.toLowerCase().startsWith(key.toLowerCase())) {
										res = FILE_TYPE_MAP.get(key);
										break;
								}
						}
				} catch (FileNotFoundException e) {
						e.printStackTrace();
				} catch (IOException e) {
						e.printStackTrace();
				}
				return res;
		}

		/**
		 * 得到上传文件的文件头
		 *
		 * @param src
		 * @return
		 */
		public static String bytesToHexString(byte[] src) {
				StringBuilder stringBuilder = new StringBuilder();
				if (src == null || src.length <= 0) {
						return null;
				}
				for (int i = 0; i < src.length; i++) {
						int v = src[i] & 0xFF;
						String hv = Integer.toHexString(v);
						if (hv.length() < 2) {
								stringBuilder.append(0);
						}
						stringBuilder.append(hv);
				}
				return stringBuilder.toString();
		}

		public static int getCheckBytesNumber() {
				return CHECK_BYTES_NUMBER;
		}

		public static void setCheckBytesNumber(int checkBytesNumber) {
				CHECK_BYTES_NUMBER = checkBytesNumber;
		}
}

